loading the mag. is not aproblem ,pushing the bolt forward the cartridge rim engages both sides of the inside of receiver, preventing forward movement .with mag. housing removed and placed next to my 91/30 for comparison, the m27 right side of receiver appears to protrude inward 1-2 mm.no idea how this damage may have happened.it will chamber if it slammed hard leaving along indentation on the brass. so how and should i remove metal ? any thoughts or ideas ? gun is in very good condition otherwise.regards paul.